import java.io.IOException;
import java.net.*;
import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:客户端
 * Author: WJW
 * Date: 2024-08-22
 * Time: 16:59
 */
public class UdpEchoClient {
    DatagramSocket socket = null;
    private String serverIp;
    private int serverPort;

    public UdpEchoClient(String serverIp,int serverPort) throws SocketException {
        this.serverIp = serverIp;
        this.serverPort = serverPort;
        socket = new DatagramSocket();
    }

    public void start() throws IOException {
        System.out.println("客户端启动！");
        Scanner scanner = new Scanner(System.in);
        while (true){
            //提示用户接下来要输入内容
            System.out.print("-> ");
            //1.从控制台读取要发送的请求数据
//            if(!scanner.hasNext()){
//                break;// 罪恶源头
//            }
            String request = scanner.next();
            //2.构造请求发送
            DatagramPacket requestPacket = new DatagramPacket(request.getBytes(),
                    request.getBytes().length,
                    InetAddress.getByName(serverIp), serverPort);
            // 少了一步发送
            socket.send(requestPacket);
            //3.读取服务器的响应
            DatagramPacket responsePacket = new DatagramPacket(new byte[4096],4096);
            socket.receive(responsePacket);
            //4.把响应显示到控制台上
            String response = new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.println(response);

        }
    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient client = new UdpEchoClient("127.0.0.1",9090);
        client.start();
    }
}
